SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67248e8275b1951a2a3427e6353fc35d73395caca18b4f6589f5094621faf5fe' 
  AND token = 'kHBht/Jhqx7F1KNsyAYQwcgUovOGKGLHvDbIFkQXfEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}